According to the features of the cyanic barren solution in a gold mine from Gansu,INCO method and alkali-chlorine method were used in the treatment,and the experimental conditions were optimized.The results show that the cyanide removal effect by INCO method is better,which can meet the wastewater discharging standard under such conditions:pH value is 11 in cyanic barren solution,sodium metabisulfite addition is 1 800 mg/L and the pulp is stirred for 1.5 h without aeration.The concentration of total cyanide in the barren solution drops from 79.59 mg/L to 0.47 mg/L,lower than 0.5 mg/L stipulated in the national wastewater discharge standard.After the treatment,the toxicity leaching indexes of tailings all meet the national requirements for pollution control of tailings pond disposal. The recycling of cyanic barren solution has little impact on the gold leaching.%针对甘肃某金矿含氰贫液特点,分别采用因科法和碱氯法处理,并对试验条件进行了优化.试验结果表明:因科法去除氰化物效果较好,在含氰贫液pH值11、焦亚硫酸钠用量1800 mg/L、不充气搅拌1.5 h条件下,处理后贫液中总氰化合物质量浓度由79.59 mg/L降至0.47 mg/L,低于国家废水排放标准规定的0.5 mg/L,处理后尾渣毒性浸出指标均达到国家尾矿库处置污染控制要求.含氰贫液循环利用于浸出流程不影响金的浸出.
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